Docstoc

Body Fluid Testing Device - Patent 7731900

Document Sample
Body Fluid Testing Device - Patent 7731900 Powered By Docstoc
					


United States Patent: 7731900


































 
( 1 of 1 )



	United States Patent 
	7,731,900



 Haar
,   et al.

 
June 8, 2010




Body fluid testing device



Abstract

The present invention concerns a body fluid testing device (10) for
     analyzing a body fluids, comprising a test media tape (30) adapted to
     collect the body fluid, a supply portion (100) storing an uncontaminated
     section of the test media tape, a storage portion (110) for storing a
     contaminated section of the test media tape, an exposure portion
     positioned between the supply portion and the storage portion, the
     exposure portion being adapted to expose a section of the test media tape
     to the body fluid. An important aspect is a tip portion (20) for exposing
     a test medium to body fluid application. The application further concerns
     a test media cassette for housing test media. Another aspect is a testing
     device and method that employs illumination of a test medium at the site
     for body fluid application.


 
Inventors: 
 Haar; Hans-Peter (Wiesloch, DE), Hoenes; Joachim (Zwingenberg, DE), List; Hans (Hesseneck-Kailbach, DE), Manser; Maria (Schwetzingen, DE), Miltner; Karl (Frankenthal, DE), Pachl; Rudolf (Ellerstadt, DE), Zimmer; Volker (Laumersheim, DE) 
 Assignee:


Roche Diagnostics Operations, Inc.
 (Indianapolis, 
IN)





Appl. No.:
                    
11/124,591
  
Filed:
                      
  May 6, 2005

 Related U.S. Patent Documents   
 

Application NumberFiling DatePatent NumberIssue Date
 PCT/EP03/13298Nov., 2003
 

 
Foreign Application Priority Data   
 

Nov 26, 2002
[EP]
02026242



 



  
Current U.S. Class:
  422/66  ; 422/100; 422/55; 422/56; 422/57; 422/63; 422/64; 422/65; 422/67; 422/99; 436/110; 436/901; 436/92; 600/583; 600/584
  
Current International Class: 
  G01N 21/00&nbsp(20060101)
  
Field of Search: 
  
  






 600/583-584 422/55-57,63-68,99-100 436/92,110,901
  

References Cited  [Referenced By]
U.S. Patent Documents
 
 
 
2714890
August 1955
Vang

3086288
April 1963
Balamuth et al.

3208452
September 1965
Stern

3298789
January 1967
Mast

3673475
June 1972
Britton, Jr.

3802842
April 1974
Lange et al.

3832776
September 1974
Sawyer

4061468
December 1977
Lange et al.

4077406
March 1978
Sandhage et al.

4154228
May 1979
Feldstein et al.

4203446
May 1980
Hofert et al.

4218421
August 1980
Mack, Jr. et al.

4223674
September 1980
Fluent et al.

4230118
October 1980
Holman et al.

4356826
November 1982
Kubota

4449529
May 1984
Burns et al.

4462405
July 1984
Ehrlich

4490465
December 1984
Limbach et al.

4518384
May 1985
Tarello et al.

4535773
August 1985
Yoon

4553541
November 1985
Burns

4627445
December 1986
Garcia et al.

4637403
January 1987
Garcia et al.

4653513
March 1987
Dombrowski

4750489
June 1988
Berkman et al.

4787398
November 1988
Garcia et al.

4794926
January 1989
Munsch et al.

4823806
April 1989
Bajada

4924879
May 1990
O'Brien

4994068
February 1991
Hufnagle

4995402
February 1991
Smith et al.

5029583
July 1991
Meserol et al.

5035704
July 1991
Lambert et al.

5047044
September 1991
Smith et al.

5053199
October 1991
Keiser et al.

5077010
December 1991
Ishizaka et al.

5097810
March 1992
Fishman et al.

5145565
September 1992
Kater et al.

5152775
October 1992
Ruppert

5188118
February 1993
Terwilliger

5189751
March 1993
Giuliani et al.

5222504
June 1993
Solomon

5228972
July 1993
Osaka et al.

5279294
January 1994
Anderson et al.

5304468
April 1994
Phillips et al.

5307263
April 1994
Brown

5320808
June 1994
Holen et al.

5366470
November 1994
Ramel

5368047
November 1994
Suzuki et al.

5415169
May 1995
Siczek et al.

5418142
May 1995
Kiser et al.

5451350
September 1995
Macho et al.

5472427
December 1995
Rammler

5474084
December 1995
Cunniff

5514152
May 1996
Smith

5515170
May 1996
Matzinger et al.

5522255
June 1996
Neel et al.

5529074
June 1996
Greenfield

5575403
November 1996
Charlton et al.

5580794
December 1996
Allen

5630986
May 1997
Charlton et al.

5632410
May 1997
Moulton et al.

5648047
July 1997
Kardish et al.

5686829
November 1997
Girault

5700695
December 1997
Yassinzadeh et al.

5714390
February 1998
Hallowitz et al.

5720924
February 1998
Eikmeier et al.

5738244
April 1998
Charlton et al.

RE35803
May 1998
Lange et al.

5758643
June 1998
Wong et al.

5776157
July 1998
Thorne et al.

5776719
July 1998
Douglas et al.

5788651
August 1998
Weilandt

5800781
September 1998
Gavin et al.

5801057
September 1998
Smart et al.

5810199
September 1998
Charlton et al.

5823973
October 1998
Racchini et al.

5824491
October 1998
Priest et al.

5830219
November 1998
Bird et al.

5846490
December 1998
Yokota et al.

5854074
December 1998
Charlton et al.

5855801
January 1999
Lin et al.

5857983
January 1999
Douglas et al.

5863800
January 1999
Eikmeier et al.

5871494
February 1999
Simons et al.

5872713
February 1999
Douglas et al.

5879311
March 1999
Duchon et al.

5880829
March 1999
Kauhaniemi et al.

5885211
March 1999
Eppstein et al.

5891053
April 1999
Sesekura

5916229
June 1999
Evans

5935075
August 1999
Casscells et al.

5938679
August 1999
Freeman et al.

5951492
September 1999
Douglas et al.

5951493
September 1999
Douglas et al.

5951582
September 1999
Thorne et al.

5962215
October 1999
Douglas et al.

5964718
October 1999
Duchon et al.

5968063
October 1999
Chu et al.

5971941
October 1999
Simons et al.

5997561
December 1999
Bocker et al.

6027459
February 2000
Shain et al.

6036924
March 2000
Simons et al.

6048352
April 2000
Douglas et al.

6071294
June 2000
Simons et al.

6086545
July 2000
Roe et al.

6093156
July 2000
Cunningham et al.

6099484
August 2000
Douglas et al.

6117630
September 2000
Reber et al.

6120462
September 2000
Hibner et al.

6132449
October 2000
Lum et al.

6136013
October 2000
Marshall et al.

6139562
October 2000
Mauze et al.

6143164
November 2000
Heller et al.

6152942
November 2000
Brenneman et al.

6155992
December 2000
Henning et al.

6156051
December 2000
Schraga

6159424
December 2000
Kauhaniemi et al.

6171325
January 2001
Mauze et al.

6176865
January 2001
Mauze et al.

6183489
February 2001
Douglas et al.

6193673
February 2001
Viola et al.

6203504
March 2001
Latterell et al.

6206841
March 2001
Cunningham et al.

6210420
April 2001
Mauze et al.

6210421
April 2001
Bocker et al.

6228100
May 2001
Schraga

6231531
May 2001
Lum et al.

6261241
July 2001
Burbank et al.

6261245
July 2001
Kawai et al.

6283926
September 2001
Cunningham et al.

6285454
September 2001
Douglas et al.

6306104
October 2001
Cunningham et al.

6306152
October 2001
Verdonk et al.

6315738
November 2001
Nishikawa et al.

6319210
November 2001
Douglas et al.

6332871
December 2001
Douglas et al.

6352514
March 2002
Douglas et al.

6364889
April 2002
Kheiri et al.

6364890
April 2002
Lum et al.

6375627
April 2002
Mauze et al.

6379317
April 2002
Kintzig et al.

6379969
April 2002
Mauze et al.

6391005
May 2002
Lum et al.

6402701
June 2002
Kaplan et al.

6402704
June 2002
McMorrow

6409740
June 2002
Kuhr et al.

6461496
October 2002
Feldman et al.

6472220
October 2002
Simons et al.

6485439
November 2002
Roe et al.

6488891
December 2002
Mason et al.

6491709
December 2002
Sharma et al.

6497845
December 2002
Sacherer

6503210
January 2003
Hirao et al.

6506575
January 2003
Knappe et al.

6530892
March 2003
Kelly

6988996
January 2006
Roe et al.

2001/0031931
October 2001
Cunningham et al.

2002/0002344
January 2002
Douglas et al.

2002/0004196
January 2002
Whitson

2002/0052618
May 2002
Haar et al.

2002/0082543
June 2002
Park et al.

2002/0103499
August 2002
Perez et al.

2003/0088191
May 2003
Freeman et al.

2003/0233112
December 2003
Alden et al.

2003/0233113
December 2003
Alden et al.



 Foreign Patent Documents
 
 
 
42 34 553
Apr., 1993
DE

198 19 407
Nov., 1999
DE

198 49 539
May., 2000
DE

198 57 426
Jun., 2000
DE

101 05 549
Aug., 2002
DE

0 351 891
Jan., 1990
EP

0 608 820
Aug., 1994
EP

0 823 636
Feb., 1998
EP

H06-033413
Aug., 1989
JP

04194660
Jul., 1992
JP

H06-222057
Aug., 1994
JP

9-276235
Oct., 1997
JP

H10-148635
Jun., 1998
JP

2000116768
Apr., 2000
JP

WO 93/02720
Feb., 1993
WO

WO 93/12726
Jul., 1993
WO

WO 97/42888
Nov., 1997
WO

WO 01/00090
Jan., 2001
WO

WO 01/08551
Feb., 2001
WO

WO 01/34029
May., 2001
WO

WO 01/66010
Sep., 2001
WO

WO 02/056769
Jul., 2002
WO

WO 2004/047642
Jun., 2004
WO



   Primary Examiner: Nagpaul; Jyoti


  Attorney, Agent or Firm: Woodard, Emhart, Moriarty, McNett & Henry LLP



Parent Case Text



REFERENCE TO RELATED APPLICATIONS


The present application is a continuation of International Patent
     Application No. PCT/EP2003/013298, filed Nov. 26, 2003, which claims
     foreign priority to European Patent Application No. 02 026 242.4, filed
     Nov. 26, 2002, which are hereby incorporated by reference in their
     entirety.

Claims  

The invention claimed is:

 1.  A body fluid testing device for analyzing a body fluid, comprising: a test media tape adapted to collect the body fluid, a supply portion storing an uncontaminated
section of the test media tape, a storage portion for storing a contaminated section of the test media tape, an exposure portion positioned between the supply portion and the storage portion, the exposure portion being adapted to expose a section of the
test media tape to body fluid on a body surface, wherein said exposure portion has a tip portion for exposing a test medium of said test media tape to body fluid application and said tip portion imposing a change of direction to said tape which is above
60.degree., and the body fluid testing device further comprising optics coupled with the tip portion;  said body fluid testing device having a housing with an outer contour;  wherein said tip portion at least partially extends outside the outer contour
of said housing;  wherein said tip portion has an illumination channel and a detection channel;  a proximal end of said illumination channel has a light source to illuminate said test medium;  wherein said test medium is located above a distal end of
said illumination channel;  and wherein light reflected from said test medium enters said detection channel and is received by a detector.


 2.  The device of claim 1, wherein said tip portion is located at a distal end of the device.


 3.  The device of claim 1, wherein said test media tape is housed in a cassette.


 4.  The device of claim 1, wherein said tip portion comprises guiding means which guide the test media tape to avoid a slip of the tape off the tip portion.


 5.  The device of claim 4, wherein said guiding means are one or more guide rails or at least one channel.


 6.  The device of claim 1, wherein said tip portion includes at least one optical channel for illuminating a test medium and/or detecting light reflected by a test medium.


 7.  The device of claim 1, wherein: the supply portion includes a supply reel, wherein the uncontaminated section of the test media tape is wound on the supply reel;  and the storage portion includes a storage reel, wherein the contaminated
section of the test media tape can be wound on the storage reel.


 8.  The device of claim 1, further comprising a piercing device adapted to pierce skin.


 9.  The device of claim 8, wherein said piercing device is arranged to pierce a body portion located at the tip portion.


 10.  The device of claim 1 further comprising a sensor for sensing a change of a test medium induced by reaction with said body fluid.


 11.  The device of claim 10, wherein the sensor includes: a light source and a detector;  a light transmission means coupled to the light source, the transmission means being adapted to transmit light from the light source onto a test medium; 
and a light detection means the detection means being adapted to receive reflected light from said test medium and transmits the reflected light to the detector for analysis.


 12.  The device of claim 1, wherein said tip portion is part of the device.


 13.  The device of claim 1, wherein said tip portion is adapted to impose a change of direction to said tape which is above 60 degrees while said tape is external to said housing.


 14.  A test cassette for housing test media for sampling body fluid, comprising: a section for receiving test media tape that is contaminated with past samples of the body fluid and an uncontaminated section;  a housing including a supply
portion in which the uncontaminated section of the test media tape is enclosed, the housing further including a storage portion in which a contaminated section of the test media tape can be enclosed, the housing defining an exposure opening at which the
test media tape is exposed to the body fluid;  wherein the test cassette further comprises a tip portion which guides the test media tape to expose a portion for body fluid application;  wherein said tip portion extends at least partially outside said
housing to guide the test media tape to a position external to said housing;  wherein said tip portion has an illumination channel and a detection channel;  a proximal end of said illumination channel has a light source to illuminate said test medium; 
wherein said test medium is located above a distal end of said illumination channel;  and wherein light reflected from said test medium enters said detection channel and is received by a detector.


 15.  The test cassette of claim 14, wherein said housing has a recess for receiving a sensor belonging to a testing device.


 16.  The test cassette of claim 14, wherein said cassette has a channel which forms the sole air connection between the storage portion and the surroundings of the cassette.


 17.  The cassette of claim 16, wherein successive test media on the test media tape have a distance, said distance being chosen that when a first test medium is located on the tip portion the successive test element is located within the storage
portion being sheltered from humidity by said channel.


 18.  The cassette of claim 14, wherein successive test media on the test media tape have a distance, said distance being chosen that when a first test medium is located on the tip portion the successive test element is located within the housing
of the test cassette.


 19.  The cassette of claim 18, wherein said distance is chosen so that when a first test element is located on the tip portion the successive test element is covered by overlying tape.


 20.  A body fluid testing device for analyzing a body fluid, comprising: a test media tape adapted to collect the body fluid, a supply portion for storing an uncontaminated section of the test media tape, a storage portion for storing a
contaminated section of the test media tape, an exposure portion positioned between the supply portion and the storage portion, the exposure portion being adapted to expose a section of the test media tape to the body fluid;  said testing device further
comprising a light source for illuminating an area of the test media tape located within said exposure portion to guide a user for body fluid application;  said body fluid testing device further comprising a housing with an outer contour and a tip
portion over which said test media tape runs at said exposure portion;  wherein said tip portion at least partially extends outside said outer contour of said housing;  wherein said tip portion has an illumination channel and a detection channel;  a
proximal end of said illumination channel has a light source to illuminate said test medium;  wherein said test medium is located above a distal end of said illumination channel;  and wherein light reflected from said test medium enters said detection
channel and is received by a detector.


 21.  The testing device of claim 20, wherein said light source is a light source for illuminating the test media tape for analysis of body fluid.


 22.  The testing device of claim 20, wherein said illuminated area is the area to which body fluid has to be applied.


 23.  The testing device of claim 20, further having a control unit controlling activation of said light source, said control unit activating said light source when the testing device desires a body fluid sample to be applied to the test media
tape.


 24.  The testing device of claim 20, wherein said light source illuminates an area which corresponds to a volume of body fluid required for proper analysis.


 25.  A system for analyzing a body fluid, comprising: a body fluid testing device having a housing with an outer contour;  a test media tape adapted to collect the body fluid;  a supply portion storing an uncontaminated section of the test media
tape inside the housing;  a storage portion for storing a contaminated section of the test media tape inside the housing;  a convex tip portion over which the test media tape runs between the supply portion and the storage portion;  the convex tip
portion at least partially projecting outside the outer contour of the housing to expose a section of the test media tape to the body fluid outside the housing of the body fluid testing device;  wherein said convex tip portion has an illumination channel
and a detection channel;  a proximal end of said illumination channel has a light source to illuminate said test medium;  wherein said test medium is located above a distal end of said illumination channel;  and wherein light reflected from said test
medium enters said detection channel and is received by a detector.


 26.  The system of claim 25, further comprising a sensor to analyze the fluid collected on the test media tape.


 27.  The system of claim 25, wherein the test media tape has successive test media spaced apart a distance where a first test medium is located on the convex tip portion and a second test medium is located within the housing.


 28.  The system of claim 25, further comprising: the convex tip portion including an illumination channel and a detection channel;  a light source aligned with the illumination channel to illuminate at least part of the section of the test media
tape located outside of the housing;  and a detector aligned with the detection channel to receive the light from the light source that is reflected from the test media tape.


 29.  The system of claim 28, wherein the light source is configured to illuminate an area of the test media tape that corresponds to an area to be wetted by the body fluid to allow proper analysis by the detector.


 30.  The system of claim 28, wherein the body fluid testing device comprises a control unit for controlling activation of the light source when the body fluid testing device requires the body fluid for analysis.


 31.  The system of claim 25, wherein the test media tape has light guiding properties and the body fluid testing device guides light into the test media tape so that a portion of the test media tape onto which the body fluid is applied is
illuminated.  Description  

BACKGROUND OF THE INVENTION


The present invention relates to body fluid testing devices and more specifically, but not exclusively, concerns a body fluid testing device that incorporates a test media cassette which contains test media used to test body fluid.


General Fluid Testing


The acquisition and testing of body fluids is useful for many purposes, and continues to grow in importance for use in medical diagnosis and treatment, and in other diverse applications.  In the medical field, it is desirable for lay operators to
perform tests routinely, quickly and reproducibly outside of a laboratory setting, with rapid results and a readout of the resulting test information.  Testing can be performed on various body fluids, and for certain applications is particularly related
to the testing of blood and/or interstitial fluid.  Such fluids can be tested for a variety of characteristics of the fluid, or analytes contained in the fluid, in order to identify a medical condition, determine therapeutic responses, assess the
progress of treatment, and the like.


General Test Steps


The testing of body fluids basically involves the steps of obtaining the fluid sample, transferring the sample to a test device, conducting a test on the fluid sample, and displaying the results.  These steps are generally performed by a
plurality of separate instruments or devices.


Acquiring--Vascular


One method of acquiring the fluid sample involves inserting a hollow needle or syringe into a vein or artery in order to withdraw a blood sample.  However, such direct vascular blood sampling can have several limitations, including pain,
infection, and hematoma and other bleeding complications.  In addition, direct vascular blood sampling is not suitable for repeating on a routine basis, can be extremely difficult and is not advised for patients to perform on themselves.


Acquiring--Incising


The other common technique for collecting a body fluid sample is to form an incision in the skin to bring the fluid to the skin surface.  A lancet, knife or other cutting instrument is used to form the incision in the skin.  The resulting blood
or interstitial fluid specimen is then collected in a small tube or other container, or is placed directly in contact with a test strip.  The fingertip is frequently used as the fluid source because it is highly vascularized and therefore produces a good
quantity of blood.  However, the fingertip also has a large concentration of nerve endings, and lancing the fingertip can therefore be painful.  Alternate sampling sites, such as the palm of the hand, forearm, earlobe and the like, may be useful for
sampling, and are less painful.  However, they also produce lesser amounts of blood.  These alternate sites therefore are generally appropriate for use only for test systems requiring relatively small amounts of fluid, or if steps are taken to facilitate
the expression of the body fluid from the incision site.


Various methods and systems for incising the skin are known in the art.  Exemplary lancing devices are shown, for example, in U.S.  Pat.  No. Re 35,803, issued to Lange, et al. on May 19, 1998; U.S.  Pat.  No. 4,924,879, issued to O'Brien on May
15, 1990; U.S.  Pat.  No. 5,879,311, issued to Duchon et al. on Feb.  16, 1999; U.S.  Pat.  No. 5,857,983, issued to Douglas on Jan.  12, 1999; U.S.  Pat.  No. 6,183,489, issued to Douglas et al. on Feb.  6, 2001; U.S.  Pat.  No. 6,332,871, issued to
Douglas et al. on Dec.  25, 2001; and U.S.  Pat.  No. 5,964,718, issued to Duchon et al. on Oct.  12, 1999.  A representative commercial lancing device is the Accu-Chek Softclix lancet.


Expressing


Patients are frequently advised to urge fluid to the incision site, such as by applying pressure to the area surrounding the incision to milk or pump the fluid from the incision.  Mechanical devices are also known to facilitate the expression of
body fluid from an incision.  Such devices are shown, for example, in U.S.  Pat.  No. 5,879,311, issued to Duchon et al. on Feb.  16, 1999; U.S.  Pat.  No. 5,857,983, issued to Douglas on Jan.  12, 1999; U.S.  Pat.  No. 6,183,489, issued to Douglas et
al. on Feb.  6, 2001; U.S.  Pat.  No. 5,951,492, issued to Douglas et al. on Sep. 14, 1999; U.S.  Pat.  No. 5,951,493, issued to Douglas et al. on Sep. 14, 1999; U.S.  Pat.  No. 5,964,718, issued to Duchon et al. on Oct.  12, 1999; and U.S.  Pat.  No.
6,086,545, issued to Roe et al. on Jul.  11, 2000.  A representative commercial product that promotes the expression of body fluid from an incision is the Amira AtLast blood glucose system.


Sampling


The acquisition of the produced body fluid, hereafter referred to as the "sampling" of the fluid, can take various forms.  Once the fluid specimen comes to the skin surface at the incision, a sampling device is placed into contact with the fluid. Such devices may include, for example, systems in which a tube or test strip is either located adjacent the incision site prior to forming the incision, or is moved to the incision site shortly after the incision has been formed.  A sampling tube may
acquire the fluid by suction or by capillary action.  Such sampling systems may include, for example, the systems shown in U.S.  Pat.  No. 6,048,352, issued to Douglas et al. on Apr.  11, 2000; U.S.  Pat.  No. 6,099,484, issued to Douglas et al. on Aug. 
8, 2000; and U.S.  Pat.  No. 6,332,871, issued to Douglas et al. on Dec.  25, 2001.  Examples of commercial sampling devices include the Roche Compact, Amira AtLast, Glucometer Elite and Therasense FreeStyle test strips.


Testing General


The body fluid sample may be analyzed for a variety of properties or components, as is well known in the art.  For example, such analysis may be directed to hematocrit, blood glucose, coagulation, lead, iron, etc. Testing systems include such
means as optical (e.g., reflectance, absorption, fluorescence, Raman, etc.), electrochemical, and magnetic means for analyzing the sampled fluid.  Examples of such test systems include those in U.S.  Pat.  No. 5,824,491, issued to Priest et al. on Oct. 
20, 1998; U.S.  Pat.  No. 5,962,215, issued to Douglas et al. on Oct.  5, 1999; and U.S.  Pat.  No. 5,776,719, issued to Douglas et al. on Jul.  7, 1998.


Typically, a test system takes advantage of a reaction between the body fluid to be tested and a reagent present in the test system.  For example, an optical test strip will generally rely upon a color change, i.e., a change in the wavelength
absorbed or reflected by dye formed by the reagent system used.  See, e.g., U.S.  Pat.  Nos.  3,802,842; 4,061,468; and 4,490,465.


Blood Glucose


A common medical test is the measurement of blood glucose level.  The glucose level can be determined directly by analysis of the blood, or indirectly by analysis of other fluids such as interstitial fluid.  Diabetics are generally instructed to
measure their blood glucose level several times a day, depending on the nature and severity of their diabetes.  Based upon the observed pattern in the measured glucose levels, the patient and physician determine the appropriate level of insulin to be
administered, also taking into account such issues as diet, exercise and other factors.


In testing for the presence of an analyte such as glucose in a body fluid, test systems are commonly used which take advantage of an oxidation/reduction reaction which occurs using an oxidase/peroxidase detection chemistry.  The test reagent is
exposed to a sample of the body fluid for a suitable period of time, and there is a color change if the analyte (glucose) is present.  Typically, the intensity of this change is proportional to the concentration of analyte in the sample.  The color of
the reagent is then compared to a known standard which enables one to determine the amount of analyte present in the sample.  This determination can be made, for example, by a visual check or by an instrument, such as a reflectance spectrophotometer at a
selected wavelength, or a blood glucose meter.  Electrochemical and other systems are also well known for testing body fluids for properties on constituents.


Testing Media


As mentioned above, diabetics typically have to monitor their blood glucose levels throughout the day so as to ensure that their blood glucose remains within an acceptable range.  Some types sampling devices require the use of testing strips that
contain media for absorbing and/or testing the body fluid, such as blood.  After testing, the testing media contaminated with blood can be considered a biohazard and needs to be readily disposed in order to avoid other individuals from being exposed to
the contaminated test strip.  This can be especially inconvenient when the person is away from home, such as at restaurant.  Moreover, individual test elements can become easily mixed with other test strips having different expiration dates.  The use of
expired test elements may create false readings, which can result in improper treatment of the patient, such as improper insulin dosages for diabetics.


Test Media Cassettes


Analytical systems with test media cassettes which allow multiple testing have been previously described (see e.g. U.S.  Pat.  No. 4,218,421 and U.S.  Pat.  No. 5,077,010) for the environment of automated laboratory systems which use pipettes to
apply sample fluid to the test media.  These systems are therefore not suited to be used by lay people as e.g. diabetics for self testing.  DE 198 19 407 describes a test element cassette for use in the home environment.  FIG. 1 describes a tape of
electrochemical test elements having punched out regions that are presented for blood application when a test element of the tape is moved over a bended surface.  FIG. 2 of DE 198 19 407 shows a test cassette with a tape of test media for reflectometric
analysis.  Application of sample fluid, especially body fluid which is located at a body portion is cumbersome with the shown apparatus.


It was an aim of the present invention to facilitate user handling for body fluid testing.


SUMMARY OF THE INVENTION


The present invention provides various devices and methods for testing body fluid.  The present invention encompasses a body fluid testing device that contains a plurality of test media.


In accordance with one aspect of the present invention, there is provided a body fluid testing device for analyzing a body fluid.  The testing device includes a test media cassette that includes a test media tape adapted to collect the body
fluid.  The cassette includes a supply portion that stores an uncontaminated section of the test media tape.  A storage portion for storing a contaminated section of the test media tape is further employed.


The testing device is a handheld device that can be conveniently handled by an user.  The test media tape may be a part of the testing device so that the whole device is discarded when the test media tape is used up or the test media tape may be
arranged in a disposable cassette which is received in the testing device.  An important aspect of a first embodiment of the present invention is that a portion of the test media tape onto which body fluid will be applied is exposed in a tip like shape. 
For this purpose the test media tape is guided over a convex tip portion which may belong to the testing device or to the test media cassette.  Due to this tip portion body fluid can be applied to the exposed portion of the test media tape very
conveniently.


A sensing region is positioned between the supply portion and the storage portion to sense at least one property or analyte of the body fluid collected on the test media tape at the exposure portion of the cassette.


The testing device further may comprise a pricking unit for pricking a body portion.  The lancing opening of that pricking unit advantageously can be arranged in or close to the convex portion so that the tip portion can be used for convenient
pricking as well.  The pricking unit may be arranged below the test media tape and a lancing device can either penetrate the test media tape or can extend through a recess in the test media tape.


A further aspect of the present invention is a method and a device for visual user guidance for application of body fluid samples.  According to this embodiment the testing device comprises an illumination unit which indicates by illumination of
a portion of a test element where body fluid is to be applied.  The illumination serves for a timely and/or spatially guidance of the user to apply body fluid.  Further the illumination may serve to indicate the location where to position a body portion
for pricking.  An illuminated area on the test medium may further indicate the amount (or the droplet size) of body fluid which is required by the testing device.


Another aspect of the present invention concerns a test cassette for collecting a body fluid sample.  The cassette includes a test media tape, which has a section for receiving test media tape that is contaminated with past samples of the body
fluid and a section for storing and providing uncontaminated test media tape.  The cassette includes a housing that has a supply portion in which the uncontaminated section of the test media tape is enclosed.  The housing further includes a storage
portion in which the contaminated section of the test media tape is enclosed after contamination.  The cassette further includes a convex tip portion over which the test media tape runs and at which the test media tape is exposed to the body fluid.  A
supply reel is disposed in the supply portion of the housing around which the uncontaminated section of the test media tape is wrapped.  A storage reel is disposed in the storage portion of the housing around which the contaminated section of the test
media tape is wrapped.


Further this invention concerns a method of using a testing device comprising the steps of a) bringing a test element into a sample application position, b) illuminating a portion of the test element onto which sample fluid application is
desired, c) application of sample fluid to the illuminated portion, d) evaluation of a test medium of the test element to generate an analytical result e) withdrawing the test element or the test medium from the sample application position.


In case of an embodiment employing a test media tape a number of test media are located on the same test element (e.g. a tape).  The steps for bringing a test element into a sample application position and removing it from this position in this
case are made by shifting the position of the test element.  It further has to be understood that step e) can be made prior to step d) if evaluation is performed at a different position than sample application.


In case of a device receiving single use test elements an individual test element is brought into the sample application position and is taken out of the device after use.


A further step may be included in the above method which concerns a pricking for generating a body opening.


Other forms, embodiments, objects, features, advantages, benefits and aspects of the present invention shall become apparent from the detailed drawings and description contained herein. 

BRIEF DESCRIPTION OF THE DRAWINGS


FIG. 1: Testing devices having a tip portion at their distal end.


FIG. 2: Blood application to a tip portion with a finger tip.


FIG. 3: Tip portion embodiments in perspective view.


FIG. 4: Cut trough a tip portion in plane with test media tape movement direction.


FIG. 5: Embodiments of supply and storage reel arrangements.


FIG. 6: Test media tape cassette with tip portion and testing device with inserted cassette.


FIG. 7: Test media tape cassette and testing device having a tip portion with inserted cassette.


FIG. 8: Embodiments employing illuminated sample application zones.


FIG. 9: Illumination concept applied to light guiding test element.


FIG. 10: Illumination concept applied to capillary fill test element.


DESCRIPTION OF SELECTED EMBODIMENTS


For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiments illustrated in the drawings and specific language will be used to describe the same.  It will nevertheless be
understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated device, and such further applications of the principles of the invention as illustrated therein being
contemplated as would normally occur to one skilled in the art to which the invention relates.  One embodiment of the invention is shown in great detail, although it will be apparent to those skilled in the art that some of the features which are not
relevant to the invention may not be shown for the sake of clarity.


A first general concept of the present invention concerns a body fluid testing device that incorporates a test media tape.  The test media tape holds test media that are used to collect body fluid samples which are analyzed with a sensor. 
Advantageously the test media tape is housed in a cassette so that after the test media of a cassette are used up a fresh test media cassette can be inserted into the testing device.  The test media tape is indexed before or after each test so that
successive tests can be performed without requiring disposal of individual test media.  The test media can be indexed manually or automatically.


The test medium is a medium which contains a test chemistry that with analyte from a sample leads to detectable results.  For further details of test chemistry and testing see section "Testing General".  Preferably the test media are designed to
soak up the test fluid sample.  This prevents the testing device from becoming contaminated by body fluid sample.  As will be described in more detail later on it is preferred to employ a test media tape which comprises a transport tape on which test
media are arranged with free spaces between successive test media.  The preferred arrangement therefore has a structure with regions as follows: tape with test medium-tape without test medium--tape with test medium--and so on.  The tape can be made e.g.
from conventional plastic tape.  The test media are attached to the tape, e.g. by gluing, welding or by use of an adhesive tape.


A body fluid testing device (10) according to the present invention is shown in FIG. 1A.  The drawing of the device shows a housing (11) and a display (12) for displaying test results as well as instructions of use.  At the front end of the
device there can be seen a tip portion (20) over which the test media tape (30) runs.  This tip portion is a first inventive idea of the present invention.  A test medium at the front end of the testing device is exposed by the tip portion in a tip like
manner which facilitates the application of body fluid.  The tip portion for this reason at least partially projects out of the contour of the housing (11) of the testing device to be accessible for a body portion (e.g. finger or arm).


The testing device can be approached to a body surface (e.g. finger or arm) on which a body fluid sample is located with the tip portion.  In order to make the tip portion easily accessible and visible as the location where sample has to be
applied it is preferred to employ a tip like shape.  Easy access and good visibility can be achieved by a tip portion that changes the direction of movement of the test media tape by an angle of more than 60 degree, preferably more than 90 degree.


FIG. 1B shows a very similar testing device as depicted in FIG. 1A.  While the test media tape (30) in the embodiment of FIG. 1A runs from the left to the right side of the device (or vice versa) in FIG. 1B the tape runs from the upper side to
the lower side (or vice versa).


According to a second inventive concept of the present invention body fluid application can be further facilitated by illuminating a portion (30') of the test tape where the body fluid sample has to be applied.  For this functionality a
translucent test medium is advantageous.  If the test medium, however, is opaque a translucent portion of the test media tape without test medium applied to it may be employed.  However, most test media for analyte testing as e.g. reflectometric glucose
test media are partially transparent and therefore produce an easily visible lighted area on the frontside of the test medium when illumination from the backside is made and the layer of test medium is not too thick.  The artisan in this field knows how
to make test media which transmit enough light that an illumination from the backside can easily be seen by a user.  It is preferred to illuminate the backside of the test media tape with colored light (e.g. red or green) so that a better visible
illumination results as by illumination with white light would result.


The second inventive concept of the present invention includes the user guidance by illuminating a portion of the test medium or a test element to which sample fluid has to be applied.  As already described above illumination is made when the
device is ready to receive sample fluid.  Further the size of the illuminated area on the frontside of the test medium advantageously can be chosen to indicate the size of the test medium which needs to be filled with sample fluid to allow proper
analysis.  The user therefore can visually control whether he has applied enough sample fluid to the correct position on the test medium.  The illumination for user guidance is made when the test element is positioned in the testing device for sample
reception.  For illumination the same optics as for optical evaluation can be used.  However, if it is desired to indicate the size of sample fluid to be applied to the test medium it is preferred to employ a separate light source for this purpose or to
employ means that change the size of illuminated area.  For indication of application site and indication of desired sample volume in the latter case a first surface of the test medium is illuminated and a differently sized area (located within the first
area) is illuminated for evaluating the test medium.


There is a certain connection between the area wetted by sample fluid and the recognition whether proper analysis can be done.  Test media require a certain amount of sample volume to allow a reliable measurement.  The amount of liquid which is
necessary depends on a number of factors as the test chemistry, test architecture (layer structure with e.g. additional layers for removal of cells etc.), optics or electrodes and so on.  For an actual testing device where these factors are fixed and the
test medium is standardized the minimum amount of sample fluid needed for reliable measurement is a fixed number.  On the other side the area on the test medium covered by sample fluid is related to the volume of sample fluid.  In case of a non-absorbing
test medium a drop is formed with an area that is dependent on surface tension.  Based upon known surface conditions the area therefore can be related to the sample volume.  In case of an absorbing test medium the absorption capacity per area determines
the area which is wetted by a certain amount of fluid.  The wetted area on the test medium therefore is closely related to the volume of fluid applied.


The testing device according to this second inventive idea illuminates an area of the test medium which becomes wetted when a sample volume equal or above the volume required for proper analysis is applied.  The user therefore can visually
control whether the fluid sample he has applied covers the whole illuminated area or not.  This allows a twofold control if enough fluid has been applied if the body fluid sample has been applied to the correct location on the test medium.


Further it is advantageous to combine the user guidance by illumination with monitoring of fluid application to the test medium.  Such monitoring is possible by optical or electrochemical detection.  In an optical method light reflected from the
test medium is detected and a change in intensity is monitored to detect sample fluid application.  In an electrical process conductivity or capacity can be monitored to detect sample application.  The before mentioned changes of measurement signals can
be evaluated to give one or more of the following information: whether sample has been applied to the test medium, whether the sample has been applied to the correct position on the test medium whether the applied sample volume is sufficient.


Illumination at the tip portion further may serve to guide the user through the use process of the testing device.  Blinking e.g. may indicate that the testing device is ready for sample fluid to be applied and a constant light or a
deenergization of the light may show that sample has been successfully applied.


Illumination as described above can be implemented by employing a separate light source which is controlled by a control unit.  However, in case of optical measurement as common in this field the light source for measurement can advantageously be
employed for illumination of the test medium at the sampling position as well.


A testing device according to the above embodiment further has a control unit for controlling activation of the light source for illumination of the test medium.  The control unit activates the light source when the instrument waits for fluid
sample to be applied to the test medium.  Illumination in this sense does not only mean constant illumination but also includes e.g. blinking.  The illumination may remain until the user shuts down the testing device but it is preferred that the control
unit deactivates illumination or changes the type of illumination when proper application of fluid to the test medium is detected (as described above).  However, in case of optical evaluation of the test medium the illumination may be activated again for
measuring an analyte concentration in the fluid sample.


The user guidance by illumination can be employed advantageously in embodiments where the test media portion for application of sample fluid is located at a tip.  In this geometric setup the user can see the light when he is applying sample to
the test medium.  By sake of the tip geometry the user can visually monitor the application process, especially the approaching of the tip portion by a body portion on which body fluid is located.  Due to illumination at the tip portion light is not
shielded by the approaching body portion until shortly before contacting the illuminated area with sample fluid.


However, the user guidance by illumination of the sample application area can be used in a much wider field as shown in FIGS. 8 to 10.


FIG. 8 depicts a reflectometric blood glucose testing device (200) which is sold under the name AccuChek Active.TM..  The device has a port (210) for receiving individual test elements (250).  A suitable test element is shown from the upper side
and the backside.  When the test element is arranged for measurement a test element (250) is located in the port (210) so that the backside of the test medium (251) is positioned above an optical sensing unit (211).  The test medium changes color in
dependence on analyte concentration in a sample fluid (270) which is applied to the upper side of the test medium.  The backside of the test medium can be optically accessed through a recess in the test element base (252) to allow optical reading.  In
prior art systems illumination of the test medium is made for reading only but not for user guidance.  Therefore the present invention claims the concept of user guidance for sample application by illuminating an area on the test medium.  Advantageously
in this context the indication of sample fluid size and guidance for positioning of the sample fluid by use of the illumination site as well as the illuminated area size as described above can be employed.  Further it is preferred in this embodiment to
employ a continuous illumination of the sample application zone which remains until sample is applied.


In FIG. 9 there is shown the illumination for user guidance concept in the context of a light guiding test element (300).  The test element has the shape of a tube (301) made of light guiding material (e.g. a clear plastic as
polymethylmethacrylate).  On the front side of the tube there is located a test medium (301) onto which sample fluid needs to be applied for analysis.  The backside of the tube is connected to an optics (not shown) for guiding light (305) into the tube
and for receiving light reflected from the backside of the test medium (302).  For user guidance illumination can be made in the same way by guiding light into the light guiding test element so that the test medium onto which fluid has to be applied is
illuminated.  It has to be understood that this invention is not restricted to tube shaped test elements but that it also can be applied to other light guiding test elements as well.  Contrary to the conventional use of such light guiding test elements
illumination is activated when the testing device is ready for sample reception and the illumination indicates to the user that sample has to be applied.


FIG. 10 shows the illumination for user guidance in a further context.  The test element (400) is a capillary fill test element having a capillary channel (401) formed in a layer (402) of material.  This layer (401) or a layer of material located
above or below have light guiding properties.  When light (405) is directed into the back end of the test element the frontside (406) of the test element is illuminated.  Sample fluid is applied to the capillary end (407) at the frontside and the sample
fluid moves through the capillary channel to the test medium (403).  The test medium e.g. can be evaluated electrochemically by electrodes contacting the test medium.  Alternatively the test medium can be read optically trough a recess in the test
element.  In this embodiment the sample is not directly applied to the test medium itself but to a transport capillary.  The illumination indicates a portion of the test element to which sample has to be applied.  However, the sample has to be applied to
the capillary which is indicated by the illuminated end of the test element located next to the capillary end.


FIG. 2 shows the application of body fluid (40) to an exposed portion of test media tape (30) at the convex tip portion (20) of a testing device.  From the figures it can be seen how the tip portion facilitates sample application.


FIG. 3 depicts two tip portion (20) embodiments in more detail.  The embodiment of FIG. 3A has an exposure portion (21) and a guidance portion (22).  The guidance portion (22) has a channel formed by two rails (23) which guide a test media tape
for traveling on the bottom surface (24) of the channel.  The exposure portion (21) preferably has no protruding elements as e.g. rails which could hinder contacting of the test media tape sited in this area with body fluid.  The tape supporting surface
(25) further has a recess (26) as depicted in FIG. 3A.  In this recess a sensor can be disposed for evaluation of the test media tape.  Suitable sensors are optical sensors including a light source and a detector for measuring light reflected from the
test medium.  Further a sensor unit with electrodes can be disposed in that recess (26) for contacting electrochemical test media at the exposure portion (21).


It is preferred to locate the sensing portion of a sensor unit at the exposure portion since measurement can be done right after the sample has been applied and no tape transport is necessary before measurement.  However, it is also possible to
locate a measurement unit for analyte concentration measurement at another position to which the test medium is moved after sample has been applied to it.


In FIG. 3B a tip portion (20) similar to that of FIG. 3A is shown.  However, the guidance portion (22) has a circumferentially closed channel through which the test media tape runs.  The tape is therefore guided by the inner walls of that channel
to run over the exposure portion (21').  The exposure portion (21') is different to that of FIG. 3A in that it has no recess but a sensing unit is integrated into it.  This can be accomplished by e.g. making a part or the whole exposure portion (21')
from clear plastic to allow light to shine through it and to transmit light reflected from the test medium located over exposure portion (21') to a detector.


The tip portions (20) of FIGS. 3A and 3B can be a part of the testing device (10) or they can be a part of a test media tape cassette.


FIG. 4 shows a cut through tip portion (20) of FIG. 3B.  In this perspective the guidance portion (22') in form of two channels left and right from the exposure portion (21') can be seen.  The tip portion is made from an opaque plastic with an
illumination channel (27) and a detection channel (28).  At the proximal end of the illumination channel (27) a light source (50) (e.g. a LED) is disposed to illuminate a test medium located above the distal end of the illumination channel.  Light
reflected from the test medium enters the detection channel (28) at its distal end and is received by a detector (60) (e.g. a photovoltaic element or a photodiode) at the proximal end of the detection channel.  Illumination channel and/or detection
channel can be empty channels or channels in which optical elements as e.g. lenses or light transmitting fibers are located.


FIG. 4 further shows an important effect of the tip portion.  The test media tape lies on the exposure portion (21') and enters this portion in the direction shown by a first arrow (ED) and leaves the portion in direction of a second arrow (LD). 
Right hand to the tip there is shown a vector diagram in which the starting point of these two direction vectors are located on the same spot.  It can be seen that there is an angle between leaving direction (LD) and entering direction (ED).  It has been
found particularly suited to provide handling ease by employing an angle .alpha.  above 60.degree., preferably above 90.degree..  It has to be understood that this definition is not restricted to embodiments where the test media tape rests on the
exposure portion.  This definition is based on the change of direction which is imposed on the test media tape imposed by the tip portion, preferably within the exposure portion.


FIGS. 5A, B, C and D show possible arrangements of supply and storage portions for test media tape relative to the tip portion (20).  In FIG. 5A a test media storage reel (110) is located behind the tip portion (20) and behind the storage reel a
supply reel (100) is located.  The positions of the supply and the storage reel can be exchanged vice versa while still having this in-line arrangement.  The in-line arrangement is advantageous if a slim testing device is desired.


FIG. 5B depicts an embodiment where a supply (100) and a storage reel (110) are arranged side by side with the tip portion (20) in between.  This arrangement is advantageous if the tip portion (20) is part of the instrument so that the test media
tape (30) can be spanned over the tip portion during or after insertion of a test media cassette into the testing device.


FIG. 5C depicts a further alternative with two reels in a supply portion and two reels in the storage portion (110).  The arrows in all these schematic diagrams indicate the direction of movement of the test media tape during subsequent use of
portions of test medium.  The embodiment of FIG. 5C is advantageous if a slim design of the testing device is desired.  A view to FIG. 1 shows that a slim design facilitates user handling.


In FIG. 5D there is shown an embodiment where the supply and storage reel are arranged coaxially.  As can be seen this arrangement is very space efficient.  Between the reels and the tip portion (20) there is located an optical unit (55) for
evaluating a test medium (30') located at the tip portion.


In FIG. 6A there can be seen a test media cassette (90) for insertion into a testing device.  The cassette has a housing (91) in which a supply reel (100) and a storage reel (10) are located.  The cassette further comprises a tip portion (20). 
The test media tape (30) runs over the distal end (outer end) of the tip portion.  The test media tape portion on the tip portion is located outside the housing (91) and therefore exposed to the surrounding.  At the inner end (distal end) of the tip
portion the cassette has a first recess (93) in its housing for receiving an optics belonging to the testing device.  It is advantageous that the cassette has rollers or pins (92) for guiding the test media tape through the cassette.  In the depicted
embodiment the cassette has a second recess (94) for receiving a drive wheel of the testing device.  The storage reel (110) has a recess in its center and engagement elements for receiving and engaging said drive wheel.  It has to be understood that the
drive wheel recess is an option only.  Alternative an axis of the storage wheel can be employed which belongs to the cassette and which can be driven from outside the cassette.


The rotational axis (95) of the storage reel belongs to the cassette of the depicted embodiment.  However, this axis can also be realized by a recess for receiving an axis belonging to the testing device.  The supply reel (100) (or a drive which
drives that reel) should have a tension control that controls tension of the test media tape and therefore avoids a too loose or too much tensioned test media tape.


As already mentioned the test media tape is exposed to the environment at the tip portion.  Most test media are, however, destroyed or altered by humidity, sunlight etc. Therefore measures have to be taken to shelter the test media.  A first
measure is to package the whole cassette (90) before use such that a contact with humidity from the surrounding is prevented.  This can be achieved by e.g. a blister package.  Bearing in mind that the cassette housing (91) can be made as a body closed
against humidity with the exception of the tip region embodiments can be contemplated which employ a humidity proof cover over the tip region which can be removed prior to use of the cassette.


FIG. 6B shows a testing device (10) with the cassette (90) of FIG. 6A being inserted into it.  The testing device has a drive wheel (150) engaging the storage reel (110) of the cassette.  The drive wheel is driven by a motor (not shown). 
Alternative the drive wheel can be actuated manually by a user.  When a motor is employed this can be actuated by a drive unit which controls and coordinates the transfer of test media into the sampling position on the tip portion (20) and measurement. 
As already mentioned it is advantageous to conduct an evaluation of a test medium wetted with sample fluid when the test medium is located at the tip portion.  However, it is also possible to transfer a test medium wetted with sample fluid away from that
position into a spatially distinct evaluation position, e.g. within the cassette.  In FIG. 6B there can be further seen an optics (160) which belongs to the testing device and which enters the first recess (93) when the cassette (90) is inserted into the
testing device (10).  In case of optical measurement it is necessary to couple the device optics (160) with the tip portion (20).  This e.g. can be accomplished by employing a tip portion as an optical transparent tip or to include optical fibers into an
otherwise opaque tip (see e.g. FIG. 4).  The device optics (160) can be made by use of fiber optics to which a light source and a detector are coupled.


FIG. 6B further shows an important measure to shelter test media against humidity and other influences when the cassette is already in use.  As can be seen the distance of test media on the tape is chosen in a way that a second test medium (30'')
is located inside the cassette housing when a first test medium (30') is located on the tip portion (20).  Further it is preferred if the distance between successive test media is so large that a successive test element is still within the sheltering
housing when the actual test element is already located within the storage portion of the device.  Even more advantageous the distance between two successive test media is so large that the second test medium is covered by overlying tape while the first
test medium is on the tip portion.  Hence the tape overlying the second test medium is sheltering it.


FIG. 6B further shows a channel (96) inside the cassette located between tip portion and supply portion.  This channel is the only connection between the storage section (97) and the outside.  Through this channel the test media tape runs from
the storage reel on its way to the tip portion.  Channel (96) serves to limit convections into the channel which would introduce humid air into the storage section in which fresh (unused) test media are stored.  Further this channel serves as a diffusion
channel which puts a resistance on the diffusion of humidity into the storage section.


FIG. 7 shows an alternative to the embodiment of FIG. 6.  Here the differences between these two concepts will be described and for similarities reference is made to the description of FIG. 6.


FIG. 7A depicts a test media cassette (90') having a supply reel (100) and a storage reel (110).  The cassette has a first recess (93') for receiving an optics.  This embodiment also has a second recess (94') for receiving a drive wheel similar
to that described above.  However, contrary to FIG. 6 the cassette of FIG. 7 has no tip portion.


FIG. 7B shows the cassette of FIG. 7A inserted into a testing device (10').  As can be seen the testing device has a tip portion which is coupled to an evaluation optics of the testing device.  As apparent from FIGS. 7A and 7B the cassette can be
inserted into the testing device without user handling steps for guiding the test media tape onto the tip portion.  With insertion the exposed portion of test media tape is already located in front of the tip portion (20') belonging to the testing
device.  From FIG. 7C it can be seen that the tip portion (20') is moved so that test media tape from the exposed portion is moved outside the device housing.  Test media therefore can be accessed very easily by a user at the tip of the tip portion which
extends outside the contour of the testing device.


While the invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only the preferred embodiment has
been shown and described and that all changes, equivalents, and modifications that come within the spirit of the inventions defined by following claims are desired to be protected.  All publications, patents, and patent applications cited in this
specification are incorporated by reference as if each individual publication, patent, or patent application were specifically and individually indicated to be incorporated by reference and set forth in its entirety herein.


* * * * *























				
DOCUMENT INFO
Description: The present invention relates to body fluid testing devices and more specifically, but not exclusively, concerns a body fluid testing device that incorporates a test media cassette which contains test media used to test body fluid.General Fluid TestingThe acquisition and testing of body fluids is useful for many purposes, and continues to grow in importance for use in medical diagnosis and treatment, and in other diverse applications. In the medical field, it is desirable for lay operators toperform tests routinely, quickly and reproducibly outside of a laboratory setting, with rapid results and a readout of the resulting test information. Testing can be performed on various body fluids, and for certain applications is particularly relatedto the testing of blood and/or interstitial fluid. Such fluids can be tested for a variety of characteristics of the fluid, or analytes contained in the fluid, in order to identify a medical condition, determine therapeutic responses, assess theprogress of treatment, and the like.General Test StepsThe testing of body fluids basically involves the steps of obtaining the fluid sample, transferring the sample to a test device, conducting a test on the fluid sample, and displaying the results. These steps are generally performed by aplurality of separate instruments or devices.Acquiring--VascularOne method of acquiring the fluid sample involves inserting a hollow needle or syringe into a vein or artery in order to withdraw a blood sample. However, such direct vascular blood sampling can have several limitations, including pain,infection, and hematoma and other bleeding complications. In addition, direct vascular blood sampling is not suitable for repeating on a routine basis, can be extremely difficult and is not advised for patients to perform on themselves.Acquiring--IncisingThe other common technique for collecting a body fluid sample is to form an incision in the skin to bring the fluid to the skin surface. A lancet, knife o